<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>db_printlog</title>
    <link rel="stylesheet" href="apiReference.css" type="text/css" />
    <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
    <link rel="start" href="index.html" title="Berkeley DB C API Reference" />
    <link rel="up" href="utilities.html" title="Appendix A.  Berkeley DB Command Line Utilities" />
    <link rel="prev" href="db_log_verify.html" title="db_log_verify" />
    <link rel="next" href="db_recover.html" title="db_recover" />
  </head>
  <body>
    <div xmlns="" class="navheader">
      <div class="libver">
        <p>Library Version 11.2.5.3</p>
      </div>
      <table width="100%" summary="Navigation header">
        <tr>
          <th colspan="3" align="center">db_printlog</th>
        </tr>
        <tr>
          <td width="20%" align="left"><a accesskey="p" href="db_log_verify.html">Prev</a> </td>
          <th width="60%" align="center">Appendix A. 
                Berkeley DB Command Line Utilities
        </th>
          <td width="20%" align="right"> <a accesskey="n" href="db_recover.html">Next</a></td>
        </tr>
      </table>
      <hr />
    </div>
    <div class="sect1" lang="en" xml:lang="en">
      <div class="titlepage">
        <div>
          <div>
            <h2 class="title" style="clear: both"><a id="db_printlog"></a>db_printlog</h2>
          </div>
        </div>
      </div>
      <pre class="programlisting">db_printlog [-NrV] [-b start-LSN] [-e stop-LSN] [-h home] [-P password] 
    [-D bytes] </pre>
      <p>
         The <span class="command"><strong>db_printlog</strong></span> utility is a debugging utility that dumps Berkeley DB
         log files in a human-readable format.
    </p>
      <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
        <h3 class="title">Note</h3>
        <p>
                If the application(s) that use the environment make use of
                the <a class="xref" href="envset_lg_dir.html" title="DB_ENV-&gt;set_lg_dir()">DB_ENV-&gt;set_lg_dir()</a>
                method, then in order for this utility to run correctly,
                you need a
                <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a>
                file which sets the proper paths using the
                <a class="xref" href="set_lg_dir_parameter.html" title="set_lg_dir">set_lg_dir</a>
                configuration parameter.
            </p>
      </div>
      <p>
        The options are as follows:
    </p>
      <div class="itemizedlist">
        <ul type="disc">
          <li>
            <p>
                  <span class="bold"><strong>-b</strong></span>
            </p>
            <p>
                 Display log records starting at log sequence number (LSN) <span class="bold"><strong>start-LSN</strong></span>; <span class="bold"><strong>start-LSN</strong></span> is specified as a file number,
                 followed by a slash (/) character, followed by an offset number, with
                 no intervening whitespace.
            </p>
          </li>
          <li>
            <p>
                 <span class="bold"><strong>-D</strong></span>
            </p>
            <p>
                Specifies the maximum number of bytes to display for each
                key/data item found in the log. This option overrides the
                "set_data_len" parameter found in your DB_CONFIG file, if
                any.
            </p>
          </li>
          <li>
            <p>
                 <span class="bold"><strong>-e</strong></span>
            </p>
            <p>
                 Stop displaying log records at log sequence number (LSN) <span class="bold"><strong>stop-LSN</strong></span>; <span class="bold"><strong>stop-LSN</strong></span> is specified as a file number,
                 followed by a slash (/) character, followed by an offset number, with
                 no intervening whitespace.
            </p>
          </li>
          <li>
            <p>
                 <span class="bold"><strong>-h</strong></span>
            </p>
            <p>
                 Specify a home directory for the database environment; by default, the
                 current working directory is used.
            </p>
          </li>
          <li>
            <p>
                 <span class="bold"><strong>-N</strong></span>
            </p>
            <p>
                 Do not acquire shared region mutexes while running.  Other problems,
                 such as potentially fatal errors in Berkeley DB, will be ignored as
                 well. This option is intended only for debugging errors, and should
                 not be used under any other circumstances.
            </p>
          </li>
          <li>
            <p>
                 <span class="bold"><strong>-P</strong></span>
            </p>
            <p>
                 Specify an environment password.  Although Berkeley DB utilities
                 overwrite password strings as soon as possible, be aware there may be
                 a window of vulnerability on systems where unprivileged users can see
                 command-line arguments or where utilities are not able to overwrite
                 the memory containing the command-line arguments.
            </p>
          </li>
          <li>
            <p>
                 <span class="bold"><strong>-r</strong></span>
            </p>
            <p>
                Read the log files in reverse order.
            </p>
          </li>
          <li>
            <p>
                 <span class="bold"><strong>-V</strong></span>
            </p>
            <p>
                 Write the library version number to the standard output, and exit.
            </p>
          </li>
        </ul>
      </div>
      <p>
         For more information on the <span class="command"><strong>db_printlog</strong></span> output and using it to debug
         applications, see 
         <a href="../../installation/debug_printlog.html" class="olink">Reviewing Berkeley DB log files</a>.
    </p>
      <p>
         The <span class="command"><strong>db_printlog</strong></span> utility uses a Berkeley DB environment (as described
         for the <span class="bold"><strong>-h</strong></span> option, the environment
         variable <span class="bold"><strong>DB_HOME</strong></span>, or because the
         utility was run in a directory containing a Berkeley DB environment). 
         In order to avoid environment corruption when using a Berkeley DB
         environment, <span class="command"><strong>db_printlog</strong></span> should always be given the chance to detach
         from the environment and exit gracefully.  To cause <span class="command"><strong>db_printlog</strong></span> to
         release all environment resources and exit cleanly, send it an
         interrupt signal (SIGINT).
    </p>
      <p>
         The <span class="command"><strong>db_printlog</strong></span> utility exits 0 on success, and &gt;0 if an error
         occurs.
    </p>
      <div class="sect2" lang="en" xml:lang="en">
        <div class="titlepage">
          <div>
            <div>
              <h3 class="title"><a id="idp55285968"></a>Environment Variables</h3>
            </div>
          </div>
        </div>
        <div class="sect3" lang="en" xml:lang="en">
          <div class="titlepage">
            <div>
              <div>
                <h4 class="title"><a id="idp55286160"></a>DB_HOME</h4>
              </div>
            </div>
          </div>
          <p>
                          If the <span class="bold"><strong>-h</strong></span> option is not specified and
                          the environment variable DB_HOME is set, it is used as the path of the
                          database home, as described in the
                          <a class="xref" href="envopen.html" title="DB_ENV-&gt;open()">DB_ENV-&gt;open()</a>
                          method.
                     </p>
        </div>
      </div>
    </div>
    <div class="navfooter">
      <hr />
      <table width="100%" summary="Navigation footer">
        <tr>
          <td width="40%" align="left"><a accesskey="p" href="db_log_verify.html">Prev</a> </td>
          <td width="20%" align="center">
            <a accesskey="u" href="utilities.html">Up</a>
          </td>
          <td width="40%" align="right"> <a accesskey="n" href="db_recover.html">Next</a></td>
        </tr>
        <tr>
          <td width="40%" align="left" valign="top">db_log_verify </td>
          <td width="20%" align="center">
            <a accesskey="h" href="index.html">Home</a>
          </td>
          <td width="40%" align="right" valign="top"> db_recover</td>
        </tr>
      </table>
    </div>
  </body>
</html>
